Improvement in cord-tighteners for curtains



c. BRISTOL; Gord-Tighteners for Curtains"` Patented flangia, 1874.

rim-146,427.

fri/1,

UNITED STATES PATENT 'OFFICE N A CHARLES B. BRISTOL, OF NEV HAVEN,CONNECTICUT.

IMPROVEMENT IN CORD-TIGHTENERS FOR CURTAINS.

Specification forming part of Letters Patent lim-146,427, dated January13, i874; application filed October 17, 1873. l

To all whom it may concern.:

"Be it known that I, CHARLES B. BRISTOL, of New Haven, in the county ot'New Haven and State of Connecticut, have invented a new Iinproveinent inCord-Tightener for Curtain- Fixtures; and I do hereby declare thefollowing, when taken in connection with the accompanying drawings andthe letters of reference marked thereon, to be a full, clear, and exactdescription of the saine, and `which said drawings constitute part ofthis specification, and represent, in-

Figure l, a side view; and in Fig. 2, a front view.

This invention relates to an improvement in cord-tghtener forcurtain-tixtures; and it consists in a lever constructed with aspringchainber at one end and a knob or'pulley at `the other, combinedwith a plate constructed with ears, between which the said lever ispivoted, and a spring within the said chamber, one arm ot' which bearsupon the lever, and the other upon the base or plate, as more fullyhereinafter described.

A is' a base, from which extend two ears, B B. Between these the lever Cis hung upon a pivot, D. Upon the outer end of the lever Ca pulley orknob, E, as the case may be, is attached, around which the cord F, fromthe curtain-roll, runs. Around the axis ot' the lever a spiral sprin g,c, is arranged, one arin, d, of which bears upon the base, the otherarm,

` f, upon the lever, the tendency of this spring being to throw thelever down, this force oi' the spring being at all times applied throughthe knob E of the cord, that the cord may be drawn tight. As the cordstretches, or is otherwise extended, the lever C will be thrown out,drawing down the pulley according to the stretch or extension of thecord, thus maintaining` at all times a sufficient strain upon the cordto prevent the fall of the curtain.

An advantage of this construction consists in the fact that when placedupon the jamb, as seen in Fig. l, the axis of the pulley will beparallel with the axis of the roll, and thus avoid the twist which isnecessary in the usual construction of cord-tighteners, which, whenplaced in similar position on the jamb, the axis of the pulley must beat right angles to the axis of ille roll.

To inclose or hide the spring, I form the lever with a barrel or case,G, around the axis, so as to forni a chamber to inclose the spring.

I claiin as my invention- A i.

The lever C, constructed with a spring-ch am; ber, Gr, at one end, and aknob or pulley, E, at the other end, combined with the plate A,constructed with ears B, between which the said lever is pivoted, andthe spring a within the chamber G of the lever, one arin of the saidspring bearing upon the lever, and the other upon the base, allsubstantially as specified.

CHAS. B. BRISTOL.

